Hydraulic back-pressure valve.



o: G. HAEDIKE& R. D. BRADBN.

HYDRAULIG BACK PRESSURE VALVE.

APPLICATION FILED 'JUNE 6,1914.

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HYDRAULG BACK PRESSURE VALVE.

APPLICATION FILED JUNEG, 1914. 193.@.8630 Patented Aug. 25, 1914u 2 SHEETSSHEET 2.

GTT@ HAEDIKE AND ROBERT ID. BRADEN, OF CHICAGO, lLLNOS, ASSIGNORS TO OXWELD ACIETYLENE COMPANY, OF CHICAGO, ILLINIS, A CORPORATION OF 'WEST VIR-GINA.

HYDRAULIC BACK-PRESSURE VALVE.

ddii-8,863.

Specification of Letters Patent.

latentetl faire. 25, lill.

Application filed June 6, 1914.' Serial No. 843,425.

To ZZ whom it may concern:

Bo it known that we, (')T'roG- HAnDiKn and lionnn'r D. Blumen, citizens of the United States, and residents oi Chicago, in the county of Cook and State of Illinois, have invented certain new' and useful lnr proveinents in Hydraulic Bacli-l1essuie YValves. oif which the i'olloa ing is a specilication.

Oui' invention relates to a hydraulic back pressure valve used in connection with acetylene cutting and welding apparatus.

The cutting` or welding tool comprises an instrument havingr a single outlet opening and with .tivo service lines or tubes leading to the single outlet o].iening. Through one ot the service lines acetylene gas passes from a low pressurel generator or from a suitable tank in which acetylene gas is stored; and oxygen. under comparatively high pressure.

passes through the other service line. so that .the acetylene tas and oxvuen ineet in the c t. .f 2'* cuttingor welding tool and pass out through the single opening therein. This inixtureof acetylene gas and oxygen ifornis a highly combustible gaseous combination which, when ignited, produces the necessary heat lor cutting or welding. Since the pressure in the oxygen tank is inuch greater than the pressure ivithin the acetylene ,renerator7 it is obvious that under certain conditions the ignited gases at the tool end might be carried back through the acetylene supply line or pipe into 'the acetylene generator, resulting in an e.\;plosion. To avoid such an clcui-rence. ive have devised a back pressure valve `which places an eilective vvater seal in the acetylene line whereby ignited gases entering the acetylene line, due to back pressure. .vill be instantly extinguished and in the event that the flame at the end of the tool is extinguished and back pressure is created. such as by the end oi the tool being obstructed. the will passout through the had; pressure valv and into a suitable container or into the atmosphere, thcrel"Y avoiding` a collection of gases with in the generator, a room or building.

A. further object Ioit the .invention is to vlnediately adjust itself to a provide a valve of the character described which will be automatic in its operation to the extent that when back pressure has been created and is relieved, the valve will irncondition for further operation.

There are a nuniber of details in our improved construction essential to its successful operation which will be hereinafter more specically referred to and our improved structure, in its entirety, is shown in the accoinpanyingl drawings in Which- Figure l is a vertical section of my improvedstructure; Fig. 2 is a top plan View of Fig. l; Fig. 3 is the section on the line 3--3 in Fig. l; Fig. 4 is a. section on the line i-*4 of Fig. l; liig. 5 is a section on the line 5-5 in Fig. l; the line Cr-G in Fig. l; Fig. 7 is perspective view of a portion of the apparatus.

Retering now more particularly to the drawing. our improved valve comprises the casing` l0 Within which a niain vertical gas tube 11 is disposed,` the lower endoiE which is provided 'with threads 'l2 for threaded engagement with the threads 1'3 forined on the bottoni wall 14 of the easing l0. Near the lower end of the tube l1 a series of outlet openings l5 are formed and surrounding these outlet openings is a shell 16, the outer edge of which is provided with a series of perfor-ations 17. The casing l0 is divided into tivo compartments by/a partition 18. The space above the partitions 18 may be considered as one compartment .and the space below as another compartment. The return tulde '20. secured at one end to partition 18 and at its other end to the casing or shell lo, has its upper end opening into the upper compartment and its lovver end' openinginto: the lower compartment. A vent tube 2i, with its lower end disposed adjacent the shell lo, entends upwardly through the partition 18 and terminates beneath the -lfalllc plate that is secured to the tube 1l. The baliie vplate is :provided with suitable.

openings 23 and is of less dianieterthan the interior diameter of the tube thereby leavingamargin between its periphery and ji-the'inner wallet the casing 10. Above the shell 16 'andsurrounding the tubes 11 and 21,'"a spacing plate 24 is interposed. A baille plate 252,9,.i's arranged beneath thelo'iver end ofitheg'tul1e21 The top oi" the tube l() is inelsed by a Cup a threaded boss lend ofthe tube il a threaded connec- '1 able pipes 29 and ."'O lead i va'l've or outlet opening 31 is secured to the an l .explosion casing y10 openingr ther-cinto below the par tition 18 and a plug 32 has a screw thread ked connection with the easingl 1.0 near veyed. The

- uitod. 'generator is slightly above lower end. A generator (not shown) supplies acetylene gas to the main service line 33 (Fig. 7) and the casing,- 10 is connected to the main service. line 33 by the supply pipe 29.' 'The exhaust pipe 30 may be led to any suitable point desired.

Referring now to the welding or cutting tool (which constitutes no part et my in'- vontion but which We deem necessary to show in order that the operation of our device may be completely described) this toolcomprises ainozzle Slt7`iii1to which oxygen and acetylene gas are simultaneously conacetyleneI gras conveyed through the flexible tube 35 connected at one end to the valve 31 and at its other end to the handle 36 of the nozzle 34- which also serves as a mixing; chamber. Oxygen is stored in the tank 37 and conif'eyed from said tank through the tube 38 into the handle 36 so that the acetylene gas and oxygen enter the handle at substantially the saine point and pass therethrough into thc nozzle 34 and through the outlet opening; therein whereupon the combined sul'stances are ig- The pressure within. the acetylene atniosph ,rie pressure while the pressure within the oxygen tank lgreatly exceeds the pressure in the gen oratrnf. so that it `will readily be perceived ,tliat i' thc outlet opening in the nozzle 34, became clogged. a back pressure would bo created that would carry the very highly explos1ve mixture o'faoetylene gas and oxygen back through the acetylene gas line and into ithe generator. thereby necessarily resulting' in the event that ignited gases are so carried back or the mixture is otherwise ignited. "To" accomplish the complete object of our invention it is therefore necessary to place a liquid within the casing' 1rlO'vvhich will extinguish any ignited gases that may be carried into the casing by reason of'baok pressure and for the purpose of illustration we have shown a liquid within `25 which i's providedwith l* with which the upper the easing. The liquid within the casing is under slight pressure thereby causing the level of the liquil in the tubes 2() and 21 to bo slightly higher than the level ot the liquid within the casing. and the acetylene gas that passes through the pipe 11 leaves the pipe through the openings 1.5 and passes out through the opening 1T in the shell 1li. The primary purpose ot vthe openings 1G and 1T is to break any gus bubbles that may be formed when the acetylene gas thr 'ugh the water or other liquid in the tube 11 anda screen Q4 is arranged above the shell 16 for a similar purpose. The acetylene gas from the main service line 33 therefore passes into the tube 11 and thence passes into the lower compartment of the casing 10i `rising through the liquidv thereinland passing out of the casing throughthe valve 3l and into the pipe 35 and through the com bined handle and vmixing'chamber 36 into the tool 34. When'tlie oxygen-in the tank 37 is released 'andthe gasesllowing from the vend ot the tool 34 are ignitedthe hydraulic valvegof course performs no function during the' normaloperation of the the event that the opening tool should, for any reason, become obstructed, lthe high pressure' of the oxygen in the" tank 37 will cause a back pressure in the apparatus and the combined oxygen and acetylene gas will travel back through the hose into the casing' 10. The high pressure of apparatus but inat tlu-Se'njdf of the the oxygen'will therefore cause the liquid in the lower compartment of the casing to rise in the tubes5 11', 2G and 2L As the liquid rises the Water seal at the lower end of the tube 21 will be first broken and since there a liquid column in the tube 11 as Well as pressure therein from the acetylene gas, the back pressure gases will take the line of least resistance thereby flowing into the tube 21 and out through the' pipe 8O which is openA to the atmosphere. forced upwardly back pressure strikes the baille plate 22 and is collected within the upper compartment. '.lhereuponthe, gases pass aroundthe baille plate-22 and out into-the atmosphere. It will. be readily seen that when the obstruc- 'tion of, the' end of the tool ilis removed, the excessivebaclr pressure upon the liquid within the casing, isl relie-ved and therefore the liquid Whichhasrc'ollected in thel upper "l/Vhatever liquid is through the pipe 21 bythe f 1' compartment will flowl through the return i pipe' 20 into the lower' compartment of the casing, since the upperco'mpartrnent is open te ythe atmospherethrough the medium of l the pipe 30. .v f

Ou'r improved hydraulic valve therefore is automatic in its operation to the extent that .it assumes -its normal working condition .when the back pressure is relieved and'will continue to allow the passage of the acetyy"ofthe vent tube, a return tube in communlcation .with both compartments and having its upper 'end arranged below the upper end of said Vent tube and its lower end arranged below' the' opening in said casing, a vent opening in one compartment and an outlet opening in said Q :Lslng mto the other compnrtment and intermediate the ends of said return tubo and a screen in said main casing 10 `below the outlet opening.

OTTO G. HAEDIKE.

ROBERT D. BRADEN.

Witnesses: l

JOHN LEVEY, VWM.. J. Fmm. 

